Automatic stop for graphophones



April 2, 1929. T. KRIST AUTOMATIC S TOP FOR GRAPHOPHONES 2 Sheets-Sheet Filed. 00t- 20, 1927 April 2, 1929. KRIST 1,707,527

. AUTOMATIC STOP FOR GRAPHOPHONES Filed Oct. 20, 192 2 Sheets-Sheet 3 W MM 61cm pug Patented Apr. 2, 1929 v. UNITED STATES PATENT OF FICE.

'rIMo'r Y 33153. on CLEVELAND, 01110.

AFTOMAT IG STOPFO R GRAPHOPHONES. V

Application filedlOctober 20, 1927.' Serial No. 227,489.

This invention relates to'sound reproducing machines which use record disks and which are, provided with a tone arm carry ing the stylus which traverses the record grooves and swings over the record supportmg tabletransversely to the record grooves and the main object of thev invention is to provide an automatic stopping or braking device for discontinuing the movement of the machine automatically.

Another object of the invention is to generally improve upon automatic stops of this general character and to provide a stop mechanism which is simplein construction and efiicie'nt in operation and which is well adapted for the purpose for which it is designed.

Anotherobject of the invention is to provide an automatic stop mechanism of the character described which is adaptedfor use on all types and styles of graphophones now in general use regardless of the size of the records or the pitch of the record grooves, A still further object of the invention is,

invention will appear as the description pro-.

'ceeds and by reference to the accompanying drawing in which Fig. lis a top plan view of the preferred embodiment of my-invention attached to the standard graphophone and in which parts are broken away to more clcarlyillustrate the details of the apparatus; Fig. 2 is a top plan view somewhat similar to. Fig. 1 showing the brake in an intermediate position; Fig. 3 is a view similar to Fig. 2 with the brake in the offer ineffective position and Fig. 4 is a detail view in side elevation showing the manner of attaching a part of the mechanism to the tone arm.

Referring now. to the drawing, the numeral 1 designates the housing or casing of the graphophone within which is enclosed the mechanism for operating the device. Arranged within the housing is a motor 2 having a shaft 3 projecting upwardly there:

from and having mounted thereon an eccentrio or cam 4. The top of the housing. 1 forms a base plate or support 5 through which the shaft 3 projects and to: which the stop mechanism is secured. Pivotally A mounted on the housing l'is a tone arm 6 to the outer end of which is pivotally secured a reproducer 6' having a needle-8 thereon adapted to engage and travel over the surface of the record in a manner well known to those skilled in the art. by the tone arm 6 is an arm 7 which is pivot:

ally secured thereto by means of a pin 8 and which isprovided with a hinge joint 8. Also carried by the tone arm are a pair of spaced downwardly projecting, parallelarms 9 and 10 which serve to move the arm 7 Carried in amanner to be hereinafter more fully" described. There is a slight lost motionbetween the arm 7 and the spaced projections 9 and 10 which allows the reproducer to wobble Without moving the arm 7, thereby preventing the brake from being released until the record has been played.

Pivotally mounted on'the support'5 is an arm 11 which is secured at one end to the support 5 by means of a pin 12. Carriedby the opposite end of the arm 11 and rotat able with respect thereto is ,a member 13 which is preferably annular in shape and provided with a pin 14, the purpose of which will hereinafter appear. ricd by the support 5 is a spring 15 which bears against the arm 11 and urges the same in a counter clockwise direction as seen in Also car- Fig. 1. A stop pin 16 carried by the support 5 limits themovement of the arm 11 in this. direction. 'Pivotally secured to the support oadjacent the member '13'isa pawl 17 onev end of which is V-shaped and projects over the member 13 and other endof' which-is bent'substantially at right. angles as shown in Figs. 1, 2' and 3. i

Carried by the support 5 which is substantially T-shaped'and is pivotally secured thereto by means of a pin 20 and is 'providedwith a portion 21 which projects in close proximity to one end of the pawl 17. The latch 19 isalso. provided at one end with the projecting catch portion 22,

the purpose of which will hereinafter ap Also carried by the support 5' is a lever 23 which is pivotally secured thereto pear.

as shown at 24:. Thelever 23 is provided at one end with a resilient projecting p015 tion 25 which is disposed in close proximity is w a latch I to one end of the pawl 17, and is adapted to be engaged thereby in a manner to be hereinafter descrlbed. The lever 23 is also provided with a V-shaped extension 26 which projects over the member 13 and is adapted to be engaged by the pin 14 in a manner to be hereinafter set forth. The opposite end of the lever 23 projects under and. beyond the arm 7 as shown most clearly in Fig. 1. Disposed on opposite sides of the lever 23 are stop pins 27 and 28 which serve to limit the movement of the same. The lever 23 is also provided with a resilient portion 29shaped as shown in Fig. 1 which projects in close proximity to the latch 19 and is engaged thereby in a manner to be hereinafter described. Also carried by the support is a brake lever 30 which is pivotally secured thereto by a pin 31 and is normally urged in a clockwise direction by a spring 32, one end of which is secured to a pin 33 and the opposite end of which is secured to the brake lever. Secured to the brake lever 30 is an arm 34 carrying a brake shoe 35 which is adapted to engage with the edge of the turntable in a manner to be hereinafter described.

Also carried by the brake lever 30 is a slightly resilient arm 37 which projects outwardly therefrom at substantially right angles thereto and extends under the arm 7 and lifts and moves the same when the brake lever is moved to the position shown in Figs. 2 and 3. Secured over the shaft 3 and adapted to rotate therewith isa turntable 38 which is adapted to support the usual disk record in a manner well known to those skilled in the art.

When the shaft 3 and cam 4.- are rotated, the cam 4c engages with the edge of the member 13 and serves to rotate the same. In the preferred embodiment of my invention, the parts are so PI'OPOl'tlODcCl that the ratio of movement of the shaft 3 and member 13 is about 4: to 1. From an inspection of Figs. 1, 2 and 3, itwill be seen that one end of the pawl 17 projects over the member 13 and is engaged by the pin 14. The pin 1% also engages the Y-shapcd projection 26 and serves to move the arm 23 about its pivot 24:. The member 13 is rotated in a counter clockwise direction so'that the pin leiactuates the pawl 17 in advance of the movement of the lever 23.

The arm 7 projects over the support 5 as shown and drags on the projecting end of the lever 23 so that when the rcproducer is traveling over the record the drag on the lever 23 serves to move the same in the direction of the arrow in Fig. 1. The pin 14 striking against the Y-ShLPGLl member 26 tends to move the arm 23 in the opposite direction. The pins 27 and 28 serve to limit the movement of the lever 23 in each. direction. Carried by the support 5 is a cam of brake lever 30 performs no useful func tion as far as taking up the lost motion 13' concerned. There must be sufficient lost motion to allow for considerablewobblingof the tone arm. Some records give the'tone arm very little if any wobble and hence the excess lost motion would have to be taken up, hence the necessity for the arm 37 which takes up the lost motion and permits brake lever 30 to be moved from the position shown in Fig. 2 immediately after the stylus has been placed on the record.

When it is desired to start the machine, the record is first placed on the turntable and the brake lever 30 moved from the position shown in Fig. lie the position shown in 2, thus releasing the turntable which starts to rotate in a clockwise direction, as seen in Fig. 1. The inwardly projecting end of brake lever 30 engages the latch 19 and resilient projection 29 and moves the lever 23 about its pivot to the position shown in F ig. 2. The stylus is then placed upon the record in thensual manner. The brake lever 30 is then moved to the position shown in Fig. 3, in which position. the latch 19 is engaged by the depending end of the brake lever 30 and'is held thereby. In this position of the lever 30, the arm 37 is oil of the cam 39 so that the arm7 is in engagement with the projecting end of the lever 23. The turning of the shaft 3 and turntable'38 tend to move the rcproducer across the rccord toward the center thereof. As the shaft 3 rotates, the eccentric t engages the member 13 and rotates the same. As the member 13 is rotated, the pin 14 engages with the V-shaped portionof pawl 17 and oscillates the same. Due to the frictional engagement of the arm 7 with the projecting end of the lever the lever 23 will be in the direction of the arrow in Fig. 1 in which position the projecting portion 25 will be so disposed as to be out of the path of movement of the pawl 17. Upon continued movement of the member 13, the pin 1% engages with the Y-shaped projection 26 and moves the lever 23 in the opposite direction whereupon the projected portion 25 is brought to position to be engaged by the pawl 17 whereupon the pawl 17 will strike the projecting portion 25 and move the same against the end 21 of the latch lever 19 to release the brake lever and allow the spring 32 to move the brake shoe 35.1nto engagementwith the rim-of the turntable. Should it be desired to operate the machine in the usual manner without the automatic stop being effective, the brake lever 30 may be moved to the position shown I in Fig. 2 whereupon the mechanismv will Operate in the usual manner. a

It will therefore be seen that as long as the reproduceris traveling over the record, the arm 23 will be oscillated. vWhen the movementof the reproducer over the record is discontinued, the oscillation of the member 23 will also be discontinuedand the projecting portion 25 will be moved in a position to be engaged by the pawl 17 (if not already in this position) and upon the next operation of the pawl 17, the latch 19 will also be'seen that, with the parts in the position shown in Fig. 2, the break lever cannot be released, because of the fact that the pro jecting portion 25 is so disposed as to be out of the path of movement of the oscillatory pawl 17.

Secured to and preferably forming a part of the lever 7 is a weight 40, the end of which projects downwardly and slides over the support 5 and serves to steady the movement of the arm 7 and to prevent undue oscillation thereof due to the wobbling' of the reproducer needle with the grooves of the record.

Various changes may be made in the details of my construction without departing from the spirit of my invention and while'I have described the preferred embodiment of my invention, it is obvious thatthe arm. 7, lever arm 23 and brake lever 30 and their associated parts may each be made of a single piece of material, if desired. It is also understood that the mechanism which is carried by the support'5 may, if desired, be secured to a plate which may be secured to the support 5. tion to be limited in accordance with the scope of the appended claims.

It will now be'clear that I have provided an automatic stop mechanism which will accompllsh the ob ects ofthe lnvention asv hereinbefore' stated.

Having thus described my invention, what Iclaim is: V I l. The combination of a graphophone having aturntable adapted tosupport a record thereon, a shaftby means of which" I therefore wish my invensaid turntable may be turned, means for ro-' tating said shaft, a-re'producer adapted to travel oversaid turntable and and to engage with said record,- abrake adapted for ,en gagement with said turntable, mechanism actuated by the movement of said shaft to release said brake and to render the same effective, said mechanism being inoperative when said reproducer 1s moving over said record, said mechanism including a tone arm, a lever connected with said tone arm so as to provide a lost motion connection therebetween thereby to allow for a'wobble' of the stylus with therecord grooves.

2. The combination of agraphophone having a turntable adapted to support a record thereon, a shaft for-turning said turntable, a tone arm, a reproducer connected with said tone arm and adapted to travelover said turntable and to engage with said record, a brake adapted for engagement with said turntable, a latch holding said brake in the inoperative position while the I reproducer is traveling over said record and mechanism operated by the movement of said shaft for releasing said latch and rendering said brake eilfective, said mechanism being op'erative only when said reproducer is at rest, and including a lever having a lost motion connection with said tone arm whereby to permit a wobble of the reproducer with the grooves of the record without releasing the brake lever.

The combination of, a graphophone.

having a support, a shaft projecting through said support, amember rotatably. mounted on said support and adriving connection between said member and shaft, a pawl pivotally mounted on said support adjacent said member and adapted to be oscillated thereby, a lever pivotally mounted on said support and having. a portion at one end projectingin close proximity to said pawl and adapted to be engaged thereby, a tone arm having anarm thereon projecting over said support and adapted to frictionally engage the opposite end. ofsaid lever, said lever also having aport-ion projecting over said 'member and adapted to be engaged thereby; whereby to move said lever in one direction, said tone arm serving to move said lever in the opposite direction, a brake vlever pivotally mounted on said support, a

latch pivotally mounted on said support and having a portion adapted to be engaged by the projecting portion. of said lever, said latch also having a portion-adapted to engage said brake lever to hold the same in the off position, said member being sov mounted and constructed as to actuate said pawl in advance of saidlever whereby said brake may be released only when the move to be engaged by said brake lever, and means for rotating said shaft.

4. The combination of a graphophone having a support, a shaft extending through said support, a turntable secured over said shaft and actuated thereby, a brake lever mounted on said support and adapted to engage said turntable, spring means normally urging said brake lever to the brake position, a latch pivotally mounted on said support and adapted to engage said brake lever to hold the same in the oil position, a tone arm mounted on said graphophone, a reproducer carried by said tone arm and adapted to traverse a record supported on said turntable, a lever arm carried by said tone arm and projecting over said support and operating mechanism associated with said arm, brake lever and shaft for holding said brake lever in the off position while said reproducer is traveling over said record, and a lost motionconnection between said lever arm and tone arm for permitting a wobble o1 the reproducer within the grooves of the record without releasing the brake lever.

no combination of a graphophone having a turntable adapted to support abrake lever will be held inthe off position while said reproducer is traveling over said record.

6. The combination of a graphophone having a turntable adapted to support a record thereon, a tone arm supported on said graphophone and having a reproducer secured thereto, a lever secured to said tone,

arm and projecting beneath said turntable, a brake lever adapted for engagement with said turntable, a latch for holding said brake lever in the oil position, and mechanism operatively associated with said latch, lever and turntable for holding said brake lever in the off position while said reproducer is traveling over said record and for releasing said latch and rendering said brake effective when the movement of said reproducer is discontinued, and a lost mo tion connection between said. lever and tone arm whereby to permit a wobble of the reproducer with the grooves of a record without releasing the brake lever.

7. The combination of a graphophone having a turntable adapted to support a record thereon, of a tone arm, a reproducer connected with said tone arm, a lever connected with said tone arm and projecting beneath said turntable, a brake, a springv tending to set said brake, a latch for holding said brake into the off position, a reciprocatory brake releasing member movable to engage and trip said latch, a member actuated by the movement of said tone arm and operating to shift said brake releasing member out of operative position while the reproducer is traveling overa record, driving connection between the turntable and reciprocatory member and a lost motion connection between said lever and tone arm for permitting a wobble of the reproducer with the record grooves without releasing the brake.

S. he combination of a graphophone having a turntable adapted to support a record thereon, of a tone arm, a reproducer connected with said tone arm, a brake for said turntable, a spring tending to set said brake, a latch for holding said brake in the oil position, an oscillatory brake releasing member movable to a position to release said latch, a lever carried by said tonearm and projecting beneath said turntable, an os-' eillatory member actuated by the movement of said tone arm for preventing said brake being released while the reproducer is trav-- cling over a record, a driving connection for said oscillatory member and a lost motion connection between said lever and'tone arm to permit a wobble of the reproducer with the record grooves without releasing said brake.

9. The combination with a graphophone having a turntable adapted to support a record thereon, of a tone arm, a reproducerv connected with said tone arm, a lever connected with said tone arm and projecting beneath said turntable, a brake, a spring tending to move said brake to braking position, a latch for holding said brake in the oli position, a reciprocatory brake releasing member movable to engage and trip said latch, a member actuated by the movement of said tone arm and operating to move said brake releasing member out of operative position while the reproducer is traveling over a record, a driving connection between said turntable and reciprocatory member and a lost motion connection between said lever and tone arm for permitting a wobble ing said brake into the offposition, a reciprocatory brake releasing member movable to engage and trip said latch, a member actuated by the movement of said tone arm and operating to shift said brake releasing member out of operative position while the reproducer is traveling over a record, driving connection between the turntable and .reciprocatory member and a lost motion con- 10 nection between sald lever and tone arm for permitting 'a wobble of the reproducer will be a wedging action between the turntable and brake.

In testimony whereof, I hereunto affix my signature.

TIMOTHY KRIST. 

